Title :
Design of a hybrid ballast with magnetic shunts: application to control of HID lamps
Author :
Kaiser, Walter ; Chabu, Ivan E. ; Lourenco, Edward A C
Author_Institution :
Escola Politecnica, Sao Paulo Univ., Brazil
Abstract :
A procedure to design a lag ballast with magnetic shunts for HID lamps is proposed. A bidirectional semiconductor switch with phase angle control, connected in parallel to one of the ballast coils, acts on lamp power. The static switch control signal is provided by a power feedback loop that actuates on lamp current, compensating variations of the main voltage and/or lamp parameters. This system saves energy and extends lamp life. Measurements on a 70 W high-pressure sodium (HPS) lamp prototype ballast are presented. The dependence of the inductances on the magnetic circuit parameters is emphasized. Power factor and total harmonic distortion of line current are comparable to a conventional lag ballast
Keywords :
feedback; inductors; lamp accessories; lighting control; magnetic circuits; metal vapour lamps; power control; power semiconductor switches; 70 W; HID lamp control; bidirectional semiconductor switch; energy savings; high-pressure sodium lamp; hybrid electronic ballast; inductance; lag ballast; lamp life extension; magnetic circuit parameters; magnetic shunts; phase angle control; power factor; power feedback loop; total harmonic distortion; Coils; Distortion measurement; Electronic ballasts; Feedback loop; High intensity discharge lamps; Magnetic circuits; Magnetic semiconductors; Power semiconductor switches; Prototypes; Voltage control;
Conference_Titel :
Industry Applications Conference, 1997. Thirty-Second IAS Annual Meeting, IAS '97., Conference Record of the 1997 IEEE
Conference_Location :
New Orleans, LA
Print_ISBN :
0-7803-4067-1
DOI :
10.1109/IAS.1997.626380
